Malicious PDF — malware analysis report

Static analysis result for SHA-256 5149e4f0b96d8533…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 13:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2f079bb3b0c156ecdd2c31ef35a6b8b SHA-1: 632bc927d4e525b5fc8593201f81abbce9a79bbc SHA-256: 5149e4f0b96d853378795626eeb3c1a352c560738c947822eda07a13550c7162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gospel-streams.com/asset/ckfinder/userfiles/files/44943420846.pdf In PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/pazedimoguwatesopajumed.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/54162718945.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/22551079982.pdfIn PDF document text
    • https://hotelcorona.ro/files/vewuko.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/xusek.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bj6dn96tfj70urap9jv31km3dg/52310446215.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/zawatazoburazizoriluv.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebdd416281---54063401061.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/lidisegamudido.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/33332752071.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109140527054542.pdfIn PDF document text
    • https://harom.ro/files/file/1281034623.pdfIn PDF document text
    • https://pr-dienst.ch/file/fawapilotizi.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/82499189300.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/pidepirusukegobilavesogud.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xexavowuwo.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pavemu.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/9959688011.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gezeravorikeganozen.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/9570498084.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ef44e6a5---jugapexilejo.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vbun4t1ssmlrtpqi5nt71k99al/fipaxugam.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15163f641---fibuligafugokigojusiwi.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/33540630302.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/53237067648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+does+a+scaffolding+do+in+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 10916 bytes
SHA-256: 1ed3dbecedf5264abee498bde0ad5ed677fe0269e9e9adc1accb58fb01539aaf
font_02_sfnt_off00010cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBC 17192 bytes
SHA-256: 08afb56938c65729fe90fc583a60ffd303a50f30bfe6bb819cabe4b603c2de6e